(Newser)
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Thirteen of 14 Democratic female senators showed up Monday night at the DC Hyatt Regency for what Politico calls a "high-profile fundraiser-cum-endorsement summit" for Hillary Clinton, but it was the absent No. 14 who caused the most buzz. Sen. Elizabeth Warren still hasn't thrown her weight behind any one candidate and is one of only six Democratic senators who hasn't backed Clinton, ABC News reports. What's still a mystery is whether the Massachusetts senator opted on her own not to attend the fundraiser or if the Clinton campaign didn't invite her in the first place.

Warren's office declined comment, per ABC, and a Clinton spokeswoman simply said in a statement, "We're honored to have 13 women Senators coming together to endorse and support Hillary Clinton. This is a sign of the broad support Clinton is receiving from women across the country who know she'll fight for us." Maryland Sen. Barbara Mikulski floated another theory about Warren's no-show, via ABC. "Maybe she has a cold," she says. (Maybe Clinton and Warren need another "cordial and productive" get-together.)